Remove last references to DEBUG_SAFESTACK

The DEBUG_SAFESTACK preprocessor define is obsolete since 2008
when the non-safestack code was removed by commit 985de863.
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9070)

(cherry picked from commit d4f63f1c39c3908cd81fda07448144bafb9aba4a)

Configurations/90-team.norelease.conf

@@ -84,7 +84,7 @@ my %targets = (
         inherit_from     => [ 'BASE_unix', "x86_64_asm" ],
         cc               => "clang",
         cflags           => combine(join(' ', @gcc_devteam_warn),
-                                    "-Wno-error=overlength-strings -Wno-error=extended-offsetof -Wno-error=language-extension-token -Wno-error=unused-const-variable -Wstrict-overflow -Qunused-arguments -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DDEBUG_UNUSED -g3 -O3 -pipe",
+                                    "-Wno-error=overlength-strings -Wno-error=extended-offsetof -Wno-error=language-extension-token -Wno-error=unused-const-variable -Wstrict-overflow -Qunused-arguments -DBN_DEBUG -DCONF_DEBUG -DDEBUG_UNUSED -g3 -O3 -pipe",
                                     threads("${BSDthreads}")),
         bn_ops           => "SIXTY_FOUR_BIT_LONG",
         thread_scheme    => "pthreads",
@@ -99,7 +99,7 @@ my %targets = (
         cc               => "clang",
         cflags           => combine("-arch x86_64 -DL_ENDIAN",
                                     join(' ', @gcc_devteam_warn),
-                                    "-Wno-error=overlength-strings -Wno-error=extended-offsetof -Wno-error=language-extension-token -Wno-error=unused-const-variable -Wstrict-overflow -Qunused-arguments -DBN_DEBUG -DCONF_DEBUG -DDEBUG_SAFESTACK -DDEBUG_UNUSED -g3 -O3 -pipe",
+                                    "-Wno-error=overlength-strings -Wno-error=extended-offsetof -Wno-error=language-extension-token -Wno-error=unused-const-variable -Wstrict-overflow -Qunused-arguments -DBN_DEBUG -DCONF_DEBUG -DDEBUG_UNUSED -g3 -O3 -pipe",
                                     threads("${BSDthreads}")),
         sys_id           => "MACOSX",
         bn_ops           => "SIXTY_FOUR_BIT_LONG",

Configure

@@ -87,9 +87,6 @@ my $usage="Usage: Configure [no-<cipher> ...] [enable-<cipher> ...] [-Dxxx] [-lx
 #               linked openssl executable has rather debugging value than
 #               production quality.
 #
-# DEBUG_SAFESTACK use type-safe stacks to enforce type-safety on stack items
-#               provided to stack calls. Generates unique stack functions for
-#               each possible stack type.
 # BN_LLONG      use the type 'long long' in crypto/bn/bn.h
 # RC4_CHAR      use 'char' instead of 'int' for RC4_INT in crypto/rc4/rc4.h
 # Following are set automatically by this script